feat: setup alchemy

[mdhruvil]

Greptile Summary

This PR migrates the project from direct Wrangler configuration to Alchemy, a declarative infrastructure-as-code framework for Cloudflare. The change centralizes all Cloudflare resource configuration (D1 databases, Durable Objects, Workers) into alchemy.run.ts and replaces manual deployment workflows with Alchemy's automated deployment system.

Key Changes:

• Replaced wrangler.jsonc and manual Worker config with alchemy.run.ts for declarative infrastructure
• Updated deployment workflows to use Alchemy commands (alchemy deploy, alchemy destroy)
• Added automated PR preview environments with GitHub comment integration
• Replaced auto-generated worker-configuration.d.ts with cleaner env.d.ts using Alchemy's type inference
• Migrated from @cloudflare/vite-plugin to Alchemy's Vite plugin for TanStack Start
• Added pnpm overrides for libsodium-wrappers compatibility

Benefits:

• Automated preview deployments for every PR with automatic cleanup
• Type-safe environment configuration through Alchemy
• Simplified deployment process with single source of truth
• Better integration between infrastructure and application code

Confidence Score: 5/5

• This PR is safe to merge with no issues found
• Well-structured migration to Alchemy with clean configuration and proper error handling. All infrastructure resources are properly defined with appropriate bindings. The GitHub workflows follow best practices with environment protection and proper cleanup. No logic errors, security issues, or style violations detected.
• No files require special attention

Important Files Changed

Filename	Overview
.github/workflows/pr-preview.yml	Added PR preview workflow with deploy and cleanup jobs using Alchemy
.github/workflows/publish.yml	Added production deployment workflow for main branch using Alchemy
apps/web/alchemy.run.ts	New Alchemy configuration defining infrastructure, bindings, and GitHub comment automation
apps/web/env.d.ts	Added TypeScript types for Cloudflare environment from Alchemy configuration
apps/web/package.json	Updated scripts to use Alchemy commands and added Alchemy dependencies
apps/web/vite.config.ts	Replaced @cloudflare/vite-plugin with Alchemy's Vite plugin for TanStack Start

Sequence Diagram

sequenceDiagram
    participant Dev as Developer
    participant GH as GitHub Actions
    participant Alchemy as Alchemy CLI
    participant CF as Cloudflare
    participant App as TanStack Start App

    alt PR Preview Flow
        Dev->>GH: Push to PR
        GH->>GH: Trigger pr-preview workflow
        GH->>Alchemy: pnpm deploy (STAGE=pr-N)
        Alchemy->>Alchemy: Read alchemy.run.ts config
        Alchemy->>CF: Create D1 Database (gitflare-db)
        Alchemy->>CF: Create Durable Object (Repo)
        Alchemy->>CF: Deploy Worker with bindings
        CF-->>Alchemy: Return preview URL
        Alchemy->>GH: Post comment with preview URL
        GH-->>Dev: Display preview comment on PR
        App->>CF: Access REPO, DB, and env bindings
    else Production Deploy
        Dev->>GH: Merge to main
        GH->>GH: Trigger publish workflow
        GH->>Alchemy: pnpm deploy (STAGE=prod)
        Alchemy->>Alchemy: Read alchemy.run.ts config
        Alchemy->>CF: Update/Create D1 Database
        Alchemy->>CF: Update/Create Durable Object
        Alchemy->>CF: Deploy to custom domain
        CF-->>Alchemy: Deployment complete
        App->>CF: Access REPO, DB, and env bindings
    else PR Closed
        Dev->>GH: Close PR
        GH->>GH: Trigger cleanup-preview job
        GH->>Alchemy: pnpm destroy (STAGE=pr-N)
        Alchemy->>CF: Delete preview resources
        CF-->>Alchemy: Resources deleted
    end

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✨ Finishing touches

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• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch mdhruvil/setup-alchemy

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🚀 Preview Deployed

Your preview is ready!

Preview URL: https://gitflare-web-pr-29.mdhruvil.workers.dev

This preview was built from commit 21261f4

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[mdhruvil]

🚀 Preview Deployed

Your preview is ready!

Preview URL: https://gitflare-web-pr-29.mdhruvil.workers.dev

This preview was built from commit cf24df5

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[mdhruvil]

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